JP2015045126A - Agricultural working car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an agricultural working car which is easily returned to a former direction of travel even when the working car is shifted on either left or right side with respect to the direction of travel.SOLUTION: An agricultural working car is provided with an engine-driven drive wheel 9 at the front side of a frame 2 and a groove-cutting body 16 at the rear side of the frame 2, the groove-cutting body 16 being provided obliquely relative to the longitudinal direction and having side plates 19, 19 which are side surface parts with interval therebetween increasing toward the rear side. The groove-cutting body 16 is rotatably connected to the frame 2 by a vertical shaft part 56 in the vertical direction, and the groove-cutting body 16 is connected to the frame 2 by the vertical shaft part 56 so that it is laterally movable at the front side. Thus, when the working car is receives a force directed either left or right side according to the condition of a field, the front side of the groove-cutting body 16 is directed to either left or right side about the vertical shaft part 56 of the rear side, a force directing the working car 1 to the other side in the lateral direction by the groove-cutting body 16 directed either left or right side is generated, and the working car 1 can be returned straightly.

Description

  The present invention relates to an agricultural work vehicle that performs work in a paddy field or the like.

  Conventionally, as this type, a self-propelled vehicle in which an engine-driven traveling wheel is provided on the distal end side of a frame having a handle at the proximal end and a scraping body as a rear support member is provided below the proximal end side of the frame. This type of work machine is widely used because it employs a simple configuration in which a drive wheel is provided on one side of the frame (for example, Patent Document 1).

  Further, a scraping body that bites into the soil is provided at the rear of the work vehicle, and a groove that forms a groove in a paddy field etc. by incorporating a groove cutting body similar to the scraping body into the work vehicle. A cutting machine can be configured, and in this grooving machine, traveling driving and grooving of the grooving machine can be performed using a driving wheel on the distal end side and using a handle at the base end.

  Further, there is a work vehicle (for example, Patent Document 2) provided with idle wheels as a rear support below the base end side of the frame, and the machine main body moves forward by rotational driving of the traveling wheel on the front end side. Along with this, the idle wheel at the base end rotates while biting into the soil, the sheet hung on the idle wheel is embedded, and the sheet can be stretched on the reed, and the work with the drive wheel on the tip side in this way Cars can perform various tasks for agriculture.

  Since the work vehicle travels with the drive wheels, it does not require a force to push the drive wheels in the traveling direction.However, the worker must walk on the work vehicle, and if a groove cut body is provided, the groove cut In order to cut the groove by the body, it is necessary to apply a downward force by the handle.

  By the way, a groove cutting body such as the above-mentioned scraping body has a surface in which running resistance increases because it forms a groove by cutting it into the ground while cutting. Further, in the conventional work vehicle, a single drive wheel is provided only on one of the left and right sides of the front side of the frame. Therefore, a steering operation is required to stabilize the direction.

  Therefore, an engine-driven drive wheel is provided on the front end side of the frame, a grooved body is provided on the base end side of the frame, a saddle is provided on the frame, and a work vehicle is provided with a handle on the front side of the saddle (for example, Patent Documents). 3) has been proposed.

JP 2002-363959 A Japanese Utility Model Publication No. 5-74203 JP 2006-152710 A

  Even when a passenger work vehicle equipped with a saddle as described above is used, there is a phenomenon in which the vehicle travels slightly to the left and right due to the effects of the bumps in the field, the field conditions, and the running traces of the wheels of the rice planting machine, etc. There is. Moreover, due to the skill of rice planting, the striations are not necessarily straight, but have a delicate curve, making it difficult to drive the work vehicle accordingly. The conventional work vehicle has a structure in which the wheels and the grooved body are arranged and fixed in a straight line, thereby maintaining straight running performance, and in order to emphasize straight running performance, delicate direction adjustment while traveling However, it was a difficult structure.

  However, if the steering wheel and the wheel are provided so as to be capable of being turned, the resulting groove is constantly swaying to the left and right, and a problem that the straight groove cannot be cut is expected.

  In view of the above-described problems, an object of the present invention is to provide an agricultural work vehicle that can easily return to the original traveling direction even if the direction of the working vehicle is shifted to the left or right side with respect to the traveling direction.

  According to the first aspect of the present invention, engine-driven drive wheels are provided on the front side of the frame, and a grooved body is provided on the rear side of the frame. In the agricultural work vehicle having a side portion with a wide interval, the groove cutting body is connected to the frame by a vertical rotation fulcrum, and the groove cutting body can be moved in the left-right direction in front of the rotation fulcrum. It is connected.

  The invention according to claim 2 is characterized in that a saddle is provided on the frame, and a handle is provided on the front side of the saddle.

  Further, the invention according to claim 3 is characterized in that the front side of the groove cut body connected to be movable in the left-right direction is sandwiched by the biasing means, and the movement in the front-left-right direction is regulated by these biasing means. It is characterized by that.

  According to the configuration of the first aspect, when the work vehicle receives a force toward the left and right sides due to the conditions of the farm field, the front end side of the grooved body is directed to one side in the left and right direction around the rear rotation fulcrum. A force that turns the work vehicle to the other side in the right-and-left direction is generated by the grooved body that faces the vehicle, and the work vehicle can be returned straight.

  Also. According to the configuration of claim 2, when the work vehicle receives a force toward the left and right sides depending on the conditions of the field, tries to turn the handle to the left and right other side, and tries to twist the waist of the saddle to the other side in the left and right direction, Centering on the rotation fulcrum of the center, the front end side of the grooved body is directed to one side in the left-right direction, and the grooved body facing this one side generates a force to turn the work vehicle to the other side in the left-right direction, straightening the work vehicle Can be returned.

  According to the third aspect of the present invention, after the work vehicle is returned straight as in the first or second aspect, the grooved body is returned straight to the original direction by the force of the urging means.

1 is an overall perspective view of a work vehicle showing Example 1 of the present invention. It is a perspective view of the rear part of a working vehicle same as the above. It is a perspective view of a groove cutting body same as the above. It is a top view of the rear part of a working vehicle same as the above. It is a rear view of a front side connection structure same as the above. It is sectional drawing of a front side connection structure same as the above. It is sectional drawing of the decomposition | disassembly state of a rear side connection structure same as the above. It is a plane explanatory drawing same as the above. It is a plane explanatory view provided with the energizing means same as the above. FIG. 10A is a plan view of a conventional example, FIG. 10A shows a state where force is received from the left side, and FIG. 10B shows a state where the force is bent to the right side. FIG. 11A is a plan explanatory view of the present invention, FIG. 11A shows a state where a force is received from the left side, and FIG. 11B shows a state where the grooving machine faces the right side. FIG. 10A is a plan explanatory view of another conventional example, FIG. 10A shows a state where force is received from the left side, and FIG. 10B shows a state where the force is bent to the right side. FIG. 13A is a plan explanatory view of a conventional example provided with a handle, FIG. 13A shows a state in which a force is received from the left side, and FIG. 13B shows a state bent to the right side. 14A and 14B are plan explanatory views of the present invention, in which FIG. 14A shows a state where a force is received from the left side, and FIG. 11B shows a state where the grooving machine faces the right side. FIG. 15A is a plan explanatory view of another conventional example provided with a handle, FIG. 15A shows a state in which a force is received from the left side, and FIG. 15B shows a state bent to the right side. It is a rear view of the front side connection structure which shows Example 2 of this invention. It is a rear view of the front side connection structure which shows Example 3 of this invention.

  Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all of the configurations described below are not necessarily essential requirements of the present invention. In each embodiment, an unprecedented agricultural work vehicle is obtained by employing a different agricultural work vehicle, and the agricultural work vehicle is described respectively.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 8 show Embodiment 1 of the present invention. As shown in FIG. 1, a frame 2 of an agricultural work vehicle 1 includes a left frame body 3L in the front-rear direction provided on the left side in the traveling direction, and an upper portion thereof. And a long frame 4 in the front-rear direction, and a right frame body 3R provided on the right side in the traveling direction. An engine attachment portion 5 is provided at the base end of the long rod 4, and an engine (not shown) is attached to the engine attachment portion 5. A gear case 6 is provided at the tip of the long rod 4, and a drive shaft 7 orthogonal to the long rod 4 is supported on the gear case 6. The drive shaft 7 protrudes to the right in the traveling direction, and the right end of the drive shaft 7 is pivotally supported by the tip of the right frame body 3L. Further, the rotation of the transmission shaft 8 inserted into the long rod 4 and connected to the engine is transmitted to the drive shaft 7 via a gear mechanism (not shown) in the gear box 6. The frame 2 and the long rod 4 are made of a metal pipe material or the like, and the frame 2 is made of a square pipe.

  A drive wheel 9 is provided on the drive shaft 7, and a plurality of scraping plates 12 are fixed to the outer peripheral edge of the wheel body 11, and the wheel body 11 is formed on a boss portion inserted through the drive shaft 7. Are fixed through a plurality of spokes 14, and the boss portion is fixed to the drive shaft 7 in a non-rotating manner. Thus, in this example, the left and right frame bodies 3L and 3R are provided on the left and right in the traveling direction so as to sandwich the drive wheel 9.

  As shown in FIG. 1 and the like, the left and right frame bodies 3L and 3R have a substantially square shape when viewed from the side, and the tip 3A of the left frame body 3L is fixed to the gear case 6 so that the left and right frame bodies A grooved body 16 as a rear support is detachably fixed to the base ends 3B and 3B of 3L and 3R, and the rear support supports the rear side of the work vehicle 1 so that it can run. In addition, the eaves 4 are arranged substantially in parallel on the linear center portion 3C of the left frame body 3L, and the center portion 3C and the eaves 4 are integrally fixed by a fixing member 17.

  The groove cutting body 16 includes left and right side plates 19 and 19 that become narrower toward the front in the traveling direction, and a bottom plate 20 that closes and connects the lower ends of the side plates 19 and 19, and the front side of the bottom plate 20 is inclined. An upward front inclined surface 20A is formed, and the rear side of the bottom plate 20 is formed in a substantially horizontal direction. The outer surface of the side plate 19 is a side surface portion.

  Further, the right frame body 3R has a substantially square shape when viewed from the side, and as described above, the drive shaft 7 is pivotally supported by the distal end thereof, and the base end thereof is a horizontal member in the left-right direction. 31 is integrally connected to the rear side of the left frame body 3L.

  The work vehicle 1 has a saddle 21, and the saddle 21 has a frame-side mounting receiving member 22 fixed above the center side of the left and right frame bodies 3L, 3R. The frame portion 23 of the saddle 21 is fixed. Further, the saddle 21 is provided with a seating portion 24 at the upper portion of the frame portion 23. The seating portion 24 has a cushioning property, the seating portion 24 has a substantially planar shape, and the center line in the front-rear direction is the driving wheel. Nine wheel bodies 11 are arranged along the front-rear direction.

  Further, a handle 25 is provided on the front side of the saddle 21, and the handle 25 is provided with a pair of vertical rods 26, 26 extending obliquely on the front upper portion, and the base ends 26A, 26A of the vertical rods 26, 26 are disposed in the front-rear direction. The base end portions 26A and 26A are fixed to the frame portion 23, and a horizontal rod 27 is provided on the front side 26B and 26B facing the upper front side of the pair of vertical rods 26 and 26. On both the left and right ends of the recumbent rod 27, grip points 28 and 28 are provided respectively. The vertical rod 26 is a square pipe or the like, and the horizontal rod 27 is a round pipe or the like. Further, a cover portion 29 that covers the upper portion of the wheel 11 is provided at the lower portion of the base end portion 26A.

  Next, the front side connection structure 30 which connects the frame 2 and the front side of the grooved body 16 will be described. As shown in FIG. 5, the base ends 3B and 3B of the left and right frame bodies 3L and 3R are connected to each other by a lateral member 31 made of angle steel, and the lateral member 31 is integrally formed with a shaft mounting member 32. Have. The shaft mounting member 32 has a main body 33 that is fixed to the lower surface of the horizontal member 31, and shaft insertion portions 34 that are provided on both the left and right sides of the main body 33. A hole 34A is formed. The transverse member 31 has a long hole 31A that is long in the left-right direction. Furthermore, a substantially L-shaped moving body 35 is provided, and this moving body 35 is integrally provided with a horizontal piece portion 36 in the left-right direction and an upper vertical piece portion 37 in the vertical direction. Guide portions 36G and 36G sandwiching the front and rear are provided at the front and rear, and the cross section is substantially U-shaped as shown in FIG.

  The front and rear sides of the horizontal member 31 are sandwiched between the guide portions 36G and 36G, the horizontal piece portion 36 is disposed along the lower surface of the horizontal member 31, and a through hole 36A is formed in the horizontal piece portion 36. A bolt 38 as a connecting member is inserted into the hole 36A, the long hole 31A and the washer 38W, and a nut 38A is screwed into the bolt 38. A cylindrical collar 40 as a spacer is inserted into the bolt 38 between the horizontal piece 36 and a washer 38W, and the collar 40 is loosely inserted into the long hole 31A. The length of the collar 40 is larger than the thickness T of the transverse member 31. Accordingly, when the nut 38A is tightened, the collar 40 is tightened by the head of the bolt 38 and the nut 38A, and a predetermined clearance is created between the main body 33 and the lateral piece 36, and the left and right length L of the long hole 31A. In this range, the moving body 35 can move left and right. The washer 38W is a support member that is larger than at least the longitudinal width of the long hole 31A and supports the front side of the grooved body 16 via the moving body 35. Further, in order to facilitate the movement, a washer 38W is disposed between the lateral member 31 and the head of the bolt 38. The clearance is the difference between the length of the collar 40 and the thickness T. The dimension that the movable body 35 can move to the left and right is a value obtained by subtracting the diameter of the collar 40 from the length L of the long hole 31A.

  In this way, the upper vertical piece portion 37 is connected to the horizontal member 31 so as to be movable left and right by the connection support means including the long hole 31A, the bolt 38, the nut 38A, the washer 38W and the collar 40.

  A cylindrical body 41 in the left-right direction is fixed to the upper vertical piece 37, and a round bar 42 as an adjustment shaft is loosely inserted into the through holes 34A, 34A of the shaft insertion parts 34, 34 and the cylindrical body 41. A hole 42A for inserting a snap pin 47, which is a retaining member, is drilled on both end sides of the wire, and the snap pin 47 is inserted into the hole 42A. Further, compression coil springs 43, 43, which are urging means for the bolt 42, are respectively provided on the left and right sides of the cylinder 41. In the initial state, the compression coil spring 43 is compressed between the cylindrical body 41 and the shaft insertion portion 34, and can be further compressed from the initial state, so that the cylindrical body 41 can move left and right along the bolt 42. ing.

  An inverted T-shaped connection receiving portion 44 is provided on the front side of the groove cut body 16, and the left and right sides of the lower piece 45 of the connection reception portion 44 are fixed to the groove cut body 16. A lower vertical piece 46 projects from the upper side toward the upper side. The lower vertical piece 46 is provided with an insertion hole 46A through which the cylinder 41 is inserted, and the cylinder 41 is prevented from coming off on one side in the left-right direction with the insertion hole 46A passing through one side in the left-right direction of the cylinder 41. A washer 48 as a member is disposed, and the round bar 42 is inserted into the washer 48, and the compression coil spring 43 on one side in the left-right direction is disposed between the washer 48 and the shaft insertion part 34. The lower vertical piece 46 is located in the center of the groove cut body 16 in the left-right direction.

  Next, the rear connection structure 51 for connecting and supporting the grooved body 16 to the frame 2 at the longitudinal pivot point on the rear side from the position of the front connection structure 30 will be described.

  As shown in FIG. 1 and the like, the front end side of a support rod 52 having a substantially U-shaped plane is connected to the base ends 3B and 3B of the left and right frame bodies 3L and 3R, and the rear end side of the support rod 52 is A bifurcated bearing portion 53 is provided at the lower end of the grooved body 16 and is connected to the bearing portion 53 so as to be swingable in the front-rear direction. The connecting body 54 integrally has a horizontal axis portion 55 in the left-right direction and a vertical axis portion 56 suspended from the approximate center of the horizontal axis portion 55. The horizontal axis portion 55 and the vertical axis portion 56 are It consists of a cylinder.

  Then, in a state where the horizontal shaft portion 55 is sandwiched between the side walls 53A and 53A of the bearing portion 53, a bolt 57 serving as a rotation center is formed between the through holes 53B and 53B of the side walls 53A and 53A of the bearing portion 53 and the horizontal shaft portion 55. And a nut 57A is screwed onto the bolt 57. In this case, the bolt 57 and the nut 57A are tightened so that the horizontal shaft portion 55 is sandwiched by the bearing portion 53, and the connecting body 54 is fixed so as not to swing back and forth, and the bolt 57 and the nut 57A are tightened. Accordingly, it is possible to appropriately select the case where the connecting body 54 is swingably connected around the bolt 57.

  On the other hand, a connection receiving portion 61 for connecting the connecting body 54 is provided on the upper rear portion of the grooved body 16. The connection receiving portion 61 is provided with a horizontal horizontal hook 62 on the upper side of the left and right side plates 19 of the grooved body 16, and a protruding cylindrical portion 63 is projected upward in the horizontal center of the horizontal flange 62. Then, the vertical axis portion 56 is loosely inserted into the receiving tube portion 63. A through hole 63A is formed in the receiving tube portion 63, and a large through hole 56A larger than the through hole 63A is formed in the horizontal shaft portion 56. In this case, the through hole 56A can be formed with a larger diameter than the through hole 63A, or the through hole 56A can be formed larger in the circumferential direction than the through hole 63A.

  Then, a pin 64 as a connecting shaft is inserted into the through hole 63A and the large through hole 55A, and the connecting body 54 and the connection receiving portion 61 are connected by this pin 64. In this connected state, the receiving tube portion 63 is substantially horizontally rotatable about the longitudinal axis portion 56 by the amount of the clearance between the pin 64 and the large through hole 55A. Further, a retaining member 65 is inserted through the tip of the inserted pin 64.

  In this case, the vertical axis portion 56 is located on a substantially extended line of the front-rear direction center of the drive wheel 9 as a wheel, and in the initial state, the lower vertical piece portion 46, that is, the front side left-right direction center of the grooved body 16 is The driving wheel 9 is set so as to be positioned on a substantially extended line at the center in the front-rear direction.

  In this way, the grooved body 16 is connected to the frame 2 by the receiving cylinder part 44 which is a longitudinal pivot, and the grooved body 16 is moved to the frame 2 so as to be movable in the left-right direction in front of the position of the receiving cylinder part 44. Due to the connection, the following operations and effects can be obtained, which will be described in comparison with the prior art.

  An operator straddles the saddle 21, grabs the reed 27 of the handle 25, and gets on the work vehicle 1. When the engine 5 is started, this rotational force rotationally drives the drive wheels 9 via the transmission shaft 8, the drive shaft 7, etc., and the scraping plate 12 scrapes the soil such as the paddy field by this rotational drive. Will move forward. With this advance, the grooved body 16 behind the drive wheel 9 cuts into the groove while biting into the soil, and a groove is formed following the cross-sectional shape.

  In this way, the operator can work by placing his / her feet on the ground while straddling the work vehicle 1 and grips the front handle 25 in this state. The working vehicle 1 can be operated easily. In addition, since a part of the body weight can be applied to the grooved body 16 in a posture straddling the saddle 21, it is possible to apply a force that causes the grooved body 16 to bite into the soil.

As shown in FIG. 8, in this embodiment, the receiving tube 63 at the rear of the grooved body 16 can be used as a rotation fulcrum, and the rear of the grooved body 16 can be rotated around the receiving tube 63 in the vertical direction. And the front side of the grooved body 16 moves freely to the left and right, and the longitudinal center of the grooved body 16 slightly shifts with the receiving tube 63 as a fulcrum with respect to the longitudinal center of the drive wheel 9. be able to. Further, as shown in FIG. 9, when the linearity between the drive wheel 9 and the groove cut body 16 is shifted by installing the compression coil springs 43 and 43 on both sides of the front end of the groove cut body 16, the original state is restored. The structure is made to return.
(1) In the following, this example is compared with a comparative example.

  FIG. 10 showing a comparative example shows the work vehicle 1 in which the front and rear center of the grooved body 16 is fixed in a straight line with respect to the front and rear direction center of the drive wheel 9. When receiving the force toward the vehicle, the work vehicle 1 turns to the right and travels as it is.

  On the other hand, as shown in FIG. 11, in this embodiment, when the work vehicle 1 receives a force toward the right side due to a groove in the field, the leading end side of the groove cut body 16 moves to the right side. When the grooved body 16 is directed to the right side, the work vehicle 1 generates a force for correcting to turn left, so that the work vehicle 1 can be returned straight. When the work vehicle 1 returns straight, the groove cutting body 16 returns to the center position in the front-rear direction of the drive wheel 9 due to the elastic restoring force of the compression coil springs 43, 43, and the linearity of the work vehicle 1 is restored. On the other hand, when the work vehicle 1 receives a force toward the left side, the front end side of the grooved body 16 moves to the left side. When the grooved body 16 is directed to the left side, a force for correcting the work vehicle 1 to turn to the right is generated, and the work vehicle 1 can be returned straight.

FIG. 12 showing another comparative example shows the work vehicle 1 in which the grooved body is connected to the frame with the front side of the drive wheel 9 as the rotation fulcrum S. A force is applied to the work vehicle 1 from the left. However, since the rear side of the groove cut body 16 is shifted to the right when the curve starts to the right, the work vehicle 1 tries to turn further to the right. Conversely, when the vehicle starts to turn to the left with the force from the right, the work vehicle 1 shifts to the left and tries to turn further to the left.
(2) In the following, this example and the comparative example will be examined in consideration of steering operation.

  FIG. 13 showing a comparative example shows the work vehicle 1 in which the longitudinal center of the grooved body 16 is fixed in a straight line with respect to the longitudinal center of the drive wheel 9, and the handle 25 is fixed so as not to rotate. When the work vehicle 1 receives a force directed to the right side due to the groove, and the work vehicle 1 starts to turn right, the drive wheel 9 is not cut by the handle 25, but the handle 25 is inevitably turned to the left. However, the work vehicle 1 cannot be steered, and stress occurs.

  On the other hand, as shown in FIG. 14, in this embodiment, the work vehicle 1 starts to turn right, tries to turn the handle 25 to the left, and tries to twist the waist to the left. Shifts to the right. As a result, a force for correcting the entire work vehicle 1 to turn left is generated. When the work vehicle 1 returns straight, the groove cutting body 16 returns to the center position in the front-rear direction of the drive wheel 9 due to the elastic restoring force of the compression coil springs 43, 43, and the linearity of the work vehicle 1 is restored. Although the handle 25 cannot be cut in this way, an illusion that the direction can be adjusted by operating the handle can be generated. On the other hand, when the work vehicle 1 receives a force toward the left side, a correcting force is similarly generated.

  FIG. 15 showing another comparative example shows the work vehicle 1 in which the grooved body 16 is connected to the frame 2 with the front side of the ring body as a rotation fulcrum, and a force is applied to the work vehicle 1 from the left. When the vehicle starts to turn right, the rear side of the grooved body 16 shifts to the right, so that the work vehicle 1 tries to turn right. Therefore, the handle 25 is to be turned left and the waist is to be twisted to the left. As a result, the entire work vehicle 1 tries to turn further to the right. On the contrary, when it starts to turn to the left by the force from the right, the handle 25 is turned to the right and the waist is twisted to the right, so that the groove cut body 16 is shifted to the left and further to the left.

  Thus, in this embodiment, corresponding to claim 1, the engine-driven drive wheel 9 is provided on the front side of the frame 2, and the grooved body 16 is provided on the rear side of the frame 2. In an agricultural work vehicle having side plates 19, 19 that are inclined with respect to the direction and widen toward the rear side, the grooved body 16 is attached to the frame 2 by a vertical axis 56 that is a longitudinal pivot. Since the groove cut body 16 is connected to the frame 2 at the front side of the longitudinal axis portion 56 so as to be movable in the left-right direction, when the work vehicle 1 receives a force toward the left and right sides depending on the field conditions, Centering on the shaft 56, the front end side (front side) of the grooved body 16 is directed to one side in the left-right direction, and the grooved body 16 directed to this one side generates a force that turns the work vehicle 1 to the other side in the left-right direction. Then, the work vehicle 1 can be returned straight.

  As described above, in this embodiment, the saddle 21 is provided on the frame 2 and the handle 25 is provided on the front side of the saddle 21 in accordance with the second aspect. When the handle 25 is to be turned to the other side in the left and right direction and the waist of the saddle 21 is to be twisted to the other side in the left and right direction, the front end side of the grooved body 16 is centered on the rear vertical axis portion 56 and the same in the left and right direction. The groove cutting body 16 facing toward the one side generates a force that turns the work vehicle 1 toward the other side in the left-right direction, so that the work vehicle 1 can be returned straight.

  In this way, in this embodiment, corresponding to claim 3, the front side of the grooved cut body 16 connected to be movable in the left-right direction is sandwiched between the compression coil springs 43, 43 as urging means, and the compression coil springs 43 43, the movement in the front left / right direction is restricted, so that after the work vehicle 1 is returned straight, the grooved body 16 can be returned straight to the original direction by the force of the compression coil springs 43, 43.

  Further, as an effect of the embodiment, since the lower vertical piece 46 can be rotated in the front-rear direction around the bolt 42, even if the grooving machine 16 swings up and down during work, this is absorbed. Can do. Moreover, since the guide portions 36G and 36G for guiding the moving body 35 to the left and right along the horizontal member 31 are provided, the left and right movement of the front side of the grooved body 16 can be smoothly guided. The guide portion may be provided on the transverse member 31. Further, by using the cylindrical body 41 that is longer in the left-right direction than the thickness of the lower vertical piece 46, the connection receiving portion 44 can be smoothly moved to the left and right. Further, the value obtained by subtracting the diameter D of the collar 40 from the length L, which is a possible amount of left and right movement on the front side of the grooved body 16, is set to 2 to 60 mm (millimeters), preferably 2 to 10 mm. The orientation of the cut body 16 is easy to return. Further, since both sides of the bolt 38 as the adjustment shaft are supported by the shaft insertion portions 34, 34, a stable structure can be obtained. When the movable amount is 2 to 60 mm, the movable amount to the left and right sides is 1 to 30 mm. Further, since the connecting means for movably connecting the moving body 35 to the horizontal member 31 is provided with the collar 40, the moving body 35 can be movably connected by tightening the bolt 38. Further, since the support rod 52 is substantially U-shaped, it is structurally excellent. Further, since the round bar 42 has a cylindrical surface, the cylinder 41 can be moved smoothly. Further, since the end of the round bar 42 is inserted into the through hole 34A of the shaft insertion part 34 and the snap pin 47 is attached at a position away from the shaft insertion part 34, the round bar 42 is interposed between the snap pins 47 on both sides. Can be slid left and right, and by mounting the compression coil springs 43, 43 on both sides of the round bar 42, the coil springs 43, 43 on both sides can be evenly compressed and mounted.

  FIG. 16 shows a second embodiment of the present invention, in which the same parts as those in the first embodiment are denoted by the same reference numerals and detailed description thereof is omitted. In this example, a left and right through hole 37A is formed in the upper vertical piece portion 37, and a fixing nut 65 communicating with the through hole 37A is fixed to the outer side in the left and right direction of the upper vertical piece portion 37. Further, the lower vertical piece 46 is provided with a lower through hole 46A in the left-right direction.

  Then, the bolt 66 is inserted into the lower through hole 46A, the bolt 66 is screwed into the fixing nut 65, and the thickness of the lower vertical piece 46 is between the head 66T of the bolt 66 and the upper vertical piece 37. Further, by providing a large gap K, the front side of the groove cut body 16 is connected to the frame 2 so as to be movable in the front-rear direction. The bolt 66 is not formed with a screw portion in a portion inserted through the lower through hole 46A, but is formed on a cylindrical surface. In this case, the collar 40 is not inserted into the bolt 38, and the left and right positions of the moving body 35 can be fixed by tightening the nut 38A, and the lower vertical piece 46 is located at the center position of the interval K. The position of the moving body 35 is set by the bolt 38 and the nut 38A so that the front left-right center of the cut body 16 is substantially positioned at the front-rear center of the drive wheel 9.

  In this example, as in the first embodiment, the collar 38 is mounted on the bolt 38 so that the bolt 38 can be moved left and right, while the bolt 66 is tightened to fix the position of the lower vertical piece 46 to the movable body 35. May be used. Also, if the grooved body 16 is deformed due to long-term use, etc., and straightness is impaired, the bolt 66 is tightened to fix the position of the lower vertical piece 46 to the moving body 35, the collar 40 is removed, and the bolt 38 The moving body 35 may be fixed to the horizontal member 31.In this case, if the running direction is biased to the left or right side due to deformation of the grooved body 16 due to long-term use, etc. The lower vertical piece 46 may be moved and fixed. Note that, when the position of the lower vertical piece 46 is fixed to the moving body 35 by tightening the bolt 66, the bolt 66 having a screw part formed in substantially the entire length is used.

  As described above, also in this embodiment, the groove cut body 16 is connected to the frame 2 by the vertical axis portion 56 which is a vertical rotation fulcrum, and the groove cut body 16 can be moved in the left-right direction in front of the vertical axis portion 56. Since it is connected to the frame 2, the same operations and effects as the first embodiment are obtained.

  Further, in this example, when the traveling direction is biased to the left and right sides due to deformation of the grooved body 16 due to long-term use, the lower vertical piece 46 can be moved and fixed to the opposite left and right sides.

  FIG. 17 shows a third embodiment of the present invention, in which the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In this example, the compression coil spring 43 is not used, the washer 48 is not used, and the lower vertical piece portion 46 is fixed to the cylindrical body 41. Only the length L which is the left and right length is connected to the lower vertical piece 46 so as to be movable left and right.

  As described above, also in this embodiment, the groove cut body 16 is connected to the frame 2 by the vertical axis portion 56 which is a vertical rotation fulcrum, and the groove cut body 16 can be moved in the left-right direction in front of the vertical axis portion 56. Since it is connected to the frame 2, the same operations and effects as the first embodiment are obtained.

  The present invention is not limited to this embodiment, and various modifications can be made within the scope of the gist of the present invention. For example, in the embodiment, a large through hole 55A is provided in the vertical axis portion 56 and a through hole 63A is provided in the receiving tube portion 63. However, a through hole is provided in the vertical axis portion 56 and a large through hole larger than this through hole is provided. A receiving tube portion 63 may be provided. Further, in the groove cutting body 16, it is only necessary that the distance between the rear side surface portions that actually form the groove widens rearward. Further, in the embodiment, the compression coil spring 43 is used as the biasing means, but various biasing means can be used. For example, when a tension coil spring is used, both ends of the tension coil spring are inserted into the cylindrical body and the shaft. What is necessary is just to fix to a part.

1 Work vehicle 2 Frame 9 Drive wheel (wheel)
16 Grooved body
19 Side plate (side)
21 saddle
25 Handle
30 Front connection structure
31 Transverse member
43 Compression coil spring (biasing means)
51 Rear connection structure
56 Vertical axis (rotating spindle)
57 volts
57A nut

Claims (3)

An agriculture having an engine-driven drive wheel on the front side of the frame, a grooved body provided on the rear side of the frame, and a side surface portion in which the grooved body is inclined with respect to the front-rear direction and the interval is widened toward the rear side. An agricultural machine characterized in that, in the work vehicle, the grooved body is connected to the frame by a pivoting fulcrum in the vertical direction, and the grooved body is connected to the frame so as to be movable in the left-right direction in front of the rotational fulcrum. Work vehicle. The agricultural work vehicle according to claim 1, wherein a saddle is provided on the frame, and a handle is provided on a front side of the saddle. 3. The front side connected to the grooved body so as to be movable in the left-right direction is sandwiched by urging means, and the movement in the front-right direction is restricted by these urging means. Agricultural work vehicle as described.

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